BS EN 1356-1997 Performance test for prefabricated reinforced components of autoclaved aerated concrete or lightweight aggregate concrete with open structure under transverse load《.pdf

1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 1356 : 1997 The Eur

2、opean Standard EN 1356 : 1996 has the status of a British Standard ICS 91.100.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Performance test for prefabricated reinforced components of autoclaved aerated concrete or lightweight aggregate concrete with open structure under

3、transverse loadBS EN 1356 : 1997 This British Standard, having been prepared under the direction of the Sector Board for Building and Civil Engineering, was published under the authority of the Standards Board and comes into effect on 15 December 1997 BSI 1997 The following BSI references relate to

4、the work on this standard: Committee reference B/523 Draft for comment 93/110406 DC ISBN 0 580 27600 7 Amendments issued since publication Amd. No. Date Text affected Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee B/523,

5、 Prefabricated concrete and lightweight aggregate concrete with open structure, upon which the following bodies were represented: Aggregate Concrete Block Association Autoclaved Aerated Concrete Association British Masonry Society British Precast Concrete Federation Ltd. Department of the Environmen

6、t (Building Research Establishment) Institution of Structural Engineers Local Authority OrganizationsBS EN 1356 : 1997 BSI 1997 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN 1356 3ii BSI 1997 BS EN 1356 : 1997 National foreword This British Stan

7、dard has been prepared by Technical Committee B/523 and is the English language version of EN 1356 : 1996 Performance test for prefabricated reinforced components of autoclaved aerated concrete or lightweight aggregate concrete with open structure under transverse load, published by the European Com

8、mittee for Standardization (CEN). Cross-references Publication referred to Corresponding British Standard EN 678 : 1993 BS EN 678 : 1994 Determination of the dry density of autoclaved aerated concrete EN 769 : 1993 BS EN 679 : 1994 Determination of compressive strength of autoclaved aerated concrete

9、 EN 991 : 1995 BS EN 991 : 1996 Determination of the dimensions of prefabricated reinforced components made of autoclaved aerated concrete or lightweight aggregate concrete with open structure EN 992 : 1995 BS EN 992 : 1996 Determination of the dry density of lightweight aggregate concrete with open

10、 structure EN 1353 : 1996 BS EN 1353 : 1997 Determination of moisture content of autoclaved aerated concrete EN 1354 : 1996 BS EN 1354 : 1997 Determination of compressive strength of lightweight aggregate concrete with open structure Compliance with a British Standard does not of itself confer immun

11、ity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 8, an inside back cover and a back cover.CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r No

12、rmung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1996 Copyright reserved to CEN members Ref. No. EN 1356 : 1996 E EUROPEAN STANDARD EN 1356 NORME EUROPE ENNE EUROPA ISCHE NORM December 1996 ICS 91.100.30 Descriptors: Concrete, cellular concrete, aggregates, reinforcing materials, prefa

13、bricated elements, mechanical tests, breaking load, sag, cracking (fracturing), mechanical strength, procedure English version Performance test for prefabricated reinforced components of autoclaved aerated concrete or lightweight aggregate concrete with open structure under transverse load Essai de

14、performance sous charge transversale des e le ments pre fabrique s arme sd eb e ton cellulaire autoclave ou de be ton de granulats le gers a structure ouverte Bestimmung des Tragverhaltens von vorgefertigten bewehrten Bauteilen aus dampfgeha rtetem Porenbeton oder aus haufwerksporigem Leichtbeton un

15、ter quer zur Bauteilebene wirkender Belastung This European Standard was approved by CEN on 1996-11-30. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

16、 Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. The European Standards exist in three official versions (English, French, German). A version in any other language made by translation u

17、nder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Nethe

18、rlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.Page 2 EN 1356 : 1996 BSI 1997 Foreword This European Standard has been prepared by Technical Committee CEN/TC 177, Prefabricated reinforced components of autoclaved aerated concrete or light-weight aggregate concrete with open

19、structure, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by June 1997, and conflicting national standards shall be withdrawn at the latest by June 1997. In

20、order to meet the performance requirements as laid down in the product standards for prefabricated components of autoclaved aerated concrete and of lightweight aggregate concrete with open structure, a number of standardized test methods are necessary. According to the CEN/CENELEC Internal Regulatio

21、ns, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Conte

22、nts Page Foreword 2 1 Scope 3 2 Normative references 3 3 Principle 3 4 Apparatus 3 5 Test specimens 3 5.1 Sample 3 5.2 Measurement of component 3 5.3 Determination of midspan deflection of a horizontal component due to dead weight 4 5.4 Conditioning of component 4 6 Load test 5 6.1 Temperature condi

23、tions 5 6.2 Support conditions 5 6.3 Loading arrangement 5 6.4 Testing procedure 5 7 Observations and measurements after completion of the load test 5 8 Test report 6Page 3 EN 1356 : 1996 BSI 1997 1) A European Standard for Prefabricated reinforced components of autoclaved aerated concrete is in pre

24、paration at CEN. 1 Scope This European Standard specifies a method of determining the mechanical performances of prefabricated reinforced components of autoclaved aerated concrete (AAC) 1) or lightweight aggregate concrete with open structure (LAC) according to prEN 1520 under transverse load. These

25、 include: the midspan deflections for different load levels; the cracking load; the ultimate load by progressive loading until collapse; the position and the shape of fracture. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publication

26、s. These normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. Fo

27、r undated references the latest edition of the publication referred to applies. EN 678 Determination of dry density of autoclaved aerated concrete EN 679 Determination of compressive strength of autoclaved aerated concrete EN 991 Determination of the dimensions of prefabricated reinforced components

28、 of autoclaved aerated concrete or lightweight aggregate concrete with open structure EN 992 Determination of dry density of lightweight aggregate concrete with open structure EN 1353 Determination of moisture content of autoclaved aerated concrete EN 1354 Determination of compressive strength of li

29、ght weight aggregate concrete with open structure prEN 1520 Prefabricated components of lightweight aggregate concrete with open structure 3 Principle The component (e.g. floor slab, roof slab, or wall slab, beam) is simply supported at both ends in horizontal position and loaded by two vertical lin

30、e loads in the outer quarter points of the span until collapse in order to determine the deflection and cracking behaviour and the loadbearing capacity. Other positions of the loads may be chosen if required (e.g. for the determination of the shear capacity or for the verification of the anchorage c

31、apacity of the longitudinal reinforcement). This shall be indicated in the test report. An intermediate unloading may be carried out after the service-ability limit state has been reached in order to measure the residual deflection due to short term loading. 4 Apparatus a) A device, for applying two

32、 equal vertical loads at two lines at the outer quarter points of the span (see however second paragraph of clause 3) and perpendicular to the span of the tested components (see figure 1). The device shall be capable of increasing the load continuously and without shock and maintaining a chosen load

33、 level constant for the required time (2 to 5) min. The force applied shall be measured to an accuracy of 3 %. b) A provision, for measuring the midspan deflections of the component due to the imposed load to an accuracy of 0,1 mm. c) A provision, for measuring the midspan deflection of the componen

34、t due to the dead weight of the component to an accuracy of 0,5 mm. d) A provision, for measuring the camber (negative deflection at midspan in unloaded state before testing), if any, to an accuracy of 1 mm. e) A weighing device, for determining the weight of the component to an accuracy of 3 %. Alt

35、ernatively the weight may be determined by calculation, if possible (e.g. in the case of solid components), from the dry density, the moisture content, and the dimensions of the component. This shall be indicated in the test report. 5 Test specimens 5.1 Sample The test specimen is a whole prefabrica

36、ted reinforced component. It shall be selected in such a manner that it is representative of the product to be investigated. 5.2 Measurement of component Before the load test, the dimensions of the component shall be measured according to EN 991 and its weight shall be determined to an accuracy of 3

37、 %, e.g. by means of a weighing device suspended from a crane. If a horizontal component (e.g. floor or roof slab, beam) is produced with a camber (negative deflection) in order to compensate for deflections due to dead weight and imposed load, this shall be measured at midspan in unloaded state bef

38、ore testing while the component is resting without restraint on one of its longitudinal edges.Page 4 EN 1356 : 1996 BSI 1997 4 6 2 1 7 8 9 4 5 3 7 2 10 3 10 l/4 l/4 l/4 l/4 l l F/2 F/2 11 F 1. Prefabricated reinforced component 2. Steel rod, 20 mm, horizontally movable (roller) 3. Steel rod, e.g. 20

39、 mm, fixed to distribution plate 4 or flat steel bar respectively 4. Distribution plate, width (50 2) mm, thickness 10 mm, extending over the full width of the component 5. Equalizing layer consisting of cement mortar, gypsum plaster, or soft fibreboard 6. Flat steel bar, e.g. 15 mm X 50 mm 7. Rigid

40、 steel section with a width of at least 100 mm, extending over the full width of the component 8. Beam for distribution of the load equally on rigid steel section 9. Load application device 10. Equalizing layer consisting of cement mortar, gypsum plaster or soft fibreboard 11. Provision for measurin

41、g the midspan deflections Figure 1. Typical loading arrangement The camber shall be determined, to an accuracy of 1 mm, as the distance from the bottom side of the component at midspan to a straight-edge or a stretched string extending in the longitudinal axis of the component at the bottom side fro

42、m one end to the other. Alternatively, the measurement may be performed at both longitudinal edges. In this case the camber shall be taken as the mean value of the two individual measurements. 5.3 Determination of midspan deflection of a horizontal component due to dead weight The midspan deflection

43、 of the component due to its dead weight may be measured by any provision allowing an accuracy of 0,5 mm. A suitable means is for example a string stretched along one of the longitudinal edges from support to support and a mm scale applied at midspan. A zero reading is taken while the component is r

44、esting without restraint on the other longitudinal edge, so that the dead weight causes no deflection perpendicular to the plane of the component. Then the component is turned to a horizontal position and placed on its supports as described in 6.2 so that the dead weight is activated and the deflect

45、ion can be measured as the difference between the zero reading and the subsequent reading of the measuring provision. 5.4 Conditioning of component The component shall not be frozen during the load test, and large temperature and moisture gradients within the component shall be avoided.Page 5 EN 135

46、6 : 1996 BSI 1997 6 Load test 6.1 Temperature conditions The test may be carried out at any temperature of the test premises between + 5 C and + 40 C. If the temperature differs by more than 5 C from + 20 C this shall be indicated in the test report. 6.2 Support conditions The component shall be pla

47、ced horizontally and simply supported at both ends, the compression zone under service conditions at the top. The supports shall extend over the full width of the component. They shall be rounded and one or both shall be movable horizontally in the direction of the span (roller). The support reactio

48、ns shall be transmitted to the bottom side of the component by means of distribution plates which are at least as long as the width of the component. They shall be made of steel and have a width of (50 2) mm and a thickness of at least 10 mm. In the case of slabs the support distribution plates shal

49、l be positioned directly adjacent to the ends of the component. In the case of beams the required minimum support length shall be taken into account. In both cases other support conditions may be chosen. These shall be indicated in the test report. Where the bottom surface of the component is not plane in the support area, an equalizing layer of mortar, gypsum plaster, or soft fibreboard shall be used between the bottom surface of the component and the distribution plates. 6.3 Loading arrangement A typical